This exercise uses the radioactive decay model. The half-life of strontium-90 is 29 years. How long (in yr) will it take a 90-milligram sample to
This exercise uses the radioactive decay model. The half-life of strontium-90 is 29 years. How long (in yr) will it take a 90-milligram sample to decay to a mass of 50.4 mg? (Round your answer to the nearest whole number.) yr
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